NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 631
VERIZON NEW YORK, INC. 230
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 64
OMNIPOINT COMMUNICATIONS, INC. - NY 55
CABLEVISION LIGHTPATH, INC. - NY 55
LEVEL 3 COMMUNICATIONS, LLC - NY 53
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2012-03-16 631-490 0–9 XXXall 10 · 7 holders which blocks → TELENGY L.L.C. - NY 473G ATLANTIC NY
2012-03-16 631-502 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → TELENGY L.L.C. - NY 473G JAMESPORT NY
2012-03-16 631-542 0–9 XXXall 10 · 9 holders which blocks → TELENGY L.L.C. - NY 473G RONKONKOMA NY
2012-03-09 631-480 0–9 XXXall 10 · 4 holders which blocks → TELENGY L.L.C. - NY 473G AMITYVILLE NY
2012-02-20 631-496 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SELDEN NY
2012-02-06 631-408 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2012-02-03 631-483 0–9 XXXall 10 · 6 holders which blocks → TELENGY L.L.C. - NY 473G MONTAUK PT NY
2012-02-01 631-402 0–9 XXXall 10 · 5 holders which blocks → TELENGY L.L.C. - NY 473G BRENTWOOD NY
2012-01-27 631-459 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2011-10-10 631-417 0–9 XXXall 10 · 7 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 BABYLON NY
2011-10-06 631-562 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K PATCHOGUE NY
2011-10-06 631-573 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K SAYVILLE NY
2011-09-30 631-330 0–9 XXXwhole prefix which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 FARMINGDL NY
2011-09-13 631-461 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 RIVERHEAD NY
2011-08-10 631-448 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 YAPHANK NY
2011-07-18 631-524 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRENTWOOD NY
2011-07-11 631-416 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2011-06-22 631-620 0–9 XXXall 10 · 5 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 BABYLON NY
2011-06-09 631-464 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E AMITYVILLE NY
2011-06-03 631-527 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K E HAMPTON NY
2011-05-03 631-438 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E PATCHOGUE NY
2011-03-21 631-407 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E SOUTHOLD NY
2011-02-22 631-405 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 RIVERHEAD NY
2010-11-08 631-364 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J STONYBROOK NY
2010-10-26 631-394 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 YAPHANK NY
2010-10-25 631-388 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K BRENTWOOD NY
2010-09-10 631-358 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BABYLON NY
2010-08-26 631-353 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E SOUTHAMPTN NY
2010-08-20 631-352 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 SMITHTOWN NY
2010-08-19 631-346 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E SELDEN NY
2010-06-01 631-336 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 BRENTWOOD NY
2010-02-24 631-505 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E LINDENHST NY
2010-02-12 631-339 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E BRENTWOOD NY
2010-02-12 631-397 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E AMITYVILLE NY
2010-01-27 631-318 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 AMAGANSETT NY
2009-12-04 631-317 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PATCHOGUE NY
2009-05-27 631-572 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BABYLON NY
2009-05-19 631-565 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2009-05-13 631-605 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PATCHOGUE NY
2009-05-05 631-333 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J GREENPORT NY
2009-04-21 631-494 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 RIVERHEAD NY
2009-04-17 631-606 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K NORTHPORT NY
2009-04-02 631-522 0–9 XXXall 10 · 3 holders which blocks → CSC VOICE, LLC 612K DEER PARK NY
2009-02-09 631-533 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 CENTRAISLP NY
2008-11-14 631-579 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRENTWOOD NY
2008-09-30 631-575 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 BRENTWOOD NY
2008-09-08 631-609 0–9 XXXall 10 · 8 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2008-06-30 631-624 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2008-05-12 631-626 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2007-10-31 631-629 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K HUNTINGTON NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.